Granted Patent
Utility
US 5,358,833 · App. 07/901,035
Amorphous phthalocyanine compound or mixture of amorphous phthalocyanine compounds, and method for preparing same
Inventors:
Hisato Itoh, Takahisa Oguchi, Shin Aihara, Kenichi Sugimoto
Patented Case
View Patent ↗
Granted: Oct 25, 1994
Filed: Jun 19, 1992
Inventors
Hisato Itoh
Takahisa Oguchi
Shin Aihara
Kenichi Sugimoto
Assignees (at issue)
Mitsui Toatsu Chemicals, Incorporated
YAMAMOTO CHEMICALS, INC.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.